Expressions in standard form

Write the following expression in standard form:

(2a + 4b - 3) - (2b - 8)

Remember that in standard form you first write terms that have the variable (make sure to keep variables in alphabetical order) after you should write constant (term without the variable).

Write the following expression in standard form:

 $42d\div7d$  

Which expression shows the standard form of the following expression?

3(2a + 3b - 5)

• 5a + 6b - 2

• 6a + 3b - 5

• 6a + 9b - 5

• 6a + 9b - 15